tuigreet version 0.5.0.
Major changes, localization and bugfixing:
* tuigreet used to terminate on authentication failure, which would
pose security issues if greetd was configured to restart
automatically with an `initial_session` set. Now, tuigreet loops on
failure and keeps running (#24).
* Following the previous item, all manual means of exiting tuigreet
have been removed (such as hitting the ESC key).
* Added localization of the user interface, with initial translations
in English, French and German (thanks to @brodi1 for the German
translation).
